Jumping music children's middle school entrance examination counting jump rope kindergarten primary school students sports fitness special rope can be adjusted without knotting
3 years old 4 years old 5 years old 6 years old 7 years old 7 years old 8 years old 9 years old 10 years old 11 years old 12 years old 13 years old 14 years old and older than 14 years old